20 × 20 = 400 cm2
52 m2 = 520.000 cm2
520.000/400= 1300 ubin
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20 × 20 = 400 cm2
52 m2 = 520.000 cm2
520.000/400= 1300 ubin
luas lantai = 52m^= 520.000 cm^
ubin yg dibutuhkan = 520.000 : 400 = 1300 buah